He graduated from the Nizamia Madressa at Nishapur, with distinction.a very famous educational institution in Nishapur. Later he was appointed as a teacher at the Nizamia College in Baghdad, where he proved very successful in imparting knowledge to the scholars under his care.

This valuable gift of sustaining interest of his pupils and passing on his knowledge to them made him so famous that students from all parts of the country flocked to study under him.

Imam al-Ghazzali was fondly referred to as the 'Hujjat-ul-lslam', Proof of Islam, He is honoured as a scholar and a saint by learned men all over the world.

Al-Ghazali is generally acclaimed as the most influential thinker of the Classical period of Islam, in his autobiography "The Deliverance from Error", the Imam describes his education and his intellectual crisis, which left him so paralysed by doubt that he he gave up his academic pursuits and worldly interests and became a wandering ascetic.

This was a process (period) of mystical transformation. Later, he resumed his teaching duties, but again left these. An era of solitary life, devoted to contemplation and writing then ensued, which led to the authorship of a number of everlasting books.
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An Excerpt from the Book

(FROM) Book Four : Evil of Tongue

It is the fourth book of the third quarter of destructive.

In the Name of Allah, Most Gracious, Most Merciful.

Praise be to Allah Who made good the creation of man, and formed him in due proportion, and inspired him the light of faith with which He has adorned and beautified him, and revealed to him the faculty of speech therewith He gave him superiority over all of His creatures, and overflowed his heart with depositories of knowledge, and sent upon him a curtain from His mercy which He hung on it, and provided him with a tongue therewith to interpret what lies within the heart and mind, disclose what is concealed in him, tell the truth, and send praises and thanks for His favours on him.

I bear witness to the fact that there is none worthy of worship but Allah Almighty, the One and Only, Who has no partner with Him, and that Muhammad is His slave and Messenger, whom He honoured and exalted, and sent with a Book He revealed to him, made superior his favor, and clarified his ways "Peace be upon him".

Coming to the point: verily, tongue is one of the great favors bestowed by Allah on man, and His amazing and fine things. Although it is small in size, its sin and obedience have a great consequence. It is that the faith could be distinguished from disbelief only through the witness of tongue, and they represent the utmost degree of obedience and disobedience. Furthermore, there is neither existing nor non-existing, neither creator nor created, neither imagined or concrete, but that the tongue deals with it and either affirms or denies it. The tongue expresses of all the objects of knowledge whether in truth or in falsehood. This characteristic is lacking in all the other organs of the body. The eye, for instance, perceives only images and colours, the ear sounds, the hand the concrete bodies, etc.

The field of tongue is expansive and limitless, and it applies to both good and evil. If the tongue is released with nothing to rein it or bind its freedom, Satan then takes it to all fields of evil, and drives it to the verge of a bank that is about to collapse, until it leads him to perdition. Of a surety, nothing draws the people prone on their faces into the fire of Hell other than the evil of their tongues. None is saved from the evil of the tongue except he, who reins it with the rein of religious law: he releases it only in what benefits him in the world and the hereafter, and stops it from anything whose evil consequence is feared.

The knowledge of the praiseworthy and blameworthy states in which the tongue should be released, and acting upon that accordingly are abstruse and difficult. The tongue is the most disobedient organ upon man. There is no trouble to be exerted to release and move it. The people have indulged in avoiding its evils and vices, and its traps and snares. It is the strongest tool of Satan.